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(No Model.) 2 SheetsSheet 1.

A.. OAMPBELL. ME GHANISM FOR SHIFJ TING THEv ANGLE ROLLERS 0F PRINTINGPRESSES. No. 284,607; Patented Sept. 11, 1883,

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A. CAMPBELL. MECHANISM FOR SHIFTING THE ANGLE ROLLERS 0F PRINTINGPRESSES.

No. 284,607. PatentedSept/ll, 1883...

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I I T By hLS flttorneys,

N PtrERs. Pmlouuw -l hon Washinllon. n.c.

UNITED STATES PATENT OFFICE.

MOLOUGHLIN, on

NEW YORK, N. Y.

' MECHANISM FOR SHIFTING THE ANGLE-ROLLERS 0F PfilNTlNG-PRESSES.

t IE]i1CIFI(3'ATION forming part of Letters Patent No. 284,607, datedSeptember 11, 1883.

Application filed March 5,1883. (No model.)

To all whom it may concern.

Be it known that I, ANDREW CAMPBELL, a citizen of the United States,residing at Brooklyn, Kings county, New York, have invented certainImprovements in Mechanism for Shifting the Angle-Rollers ofPrintingPresses, of which the following is a specification.

I11 mounting the inking-rollers of a printing-press certain of theserollers are mounted to extend obliquely across the line of movement ofthe reciprocating part to which the ink is to be applied, or on whichthe ink is to be distributed. Vhen fixedly mounted at predeterminedangles, the rollers do not distribute perfectly, as they always presentthe same points on their surfaces to the same points onthe-reciprocating surface.

My invention seeks to correct these defects in the distribution-byshifting the roller so as to change its angle a little at each movementof the reciprocating part, so that it may not present itself at the sameangle to the said part twice in a great number of reciprocatorymovements of the latter. In fact, I make the movements of the partsincommensurate, so that it may require an almost infinite number ofreciprocations to bring the parts-back to their same relative positionsas at starting that is to say, it is possible to so construct themechanism that the angle-roller will not present itself twice at thesame angle to the same point on the reciprocating part in amillionrevolutions of the printing-cylinder. Thus I am enabled toeffect a nearapproach'to perfection in the distribution of the ink.

The mechanism I prefer to employ in carrying out my invention isillustrated in the accompanying drawings, wherein Figure 1 is amutilated side elevation of a part of a printing-press, showing the0011- struction and arrangement of the mechanism for shifting therollers.

end elevation of the same, taken on line 2 2 in Fig. 1. Fig. 3 is aplan, and Fig. 4 is a modification, that will be referred tohereinafter.

Let A represent a part of the side frame of a printing-press of anykind, and B a rabbetstrip or angle-strip mounted on and secured to saidframe. In the angle of the strip B is mounted a slide, 0, which isretained in place,

Fig. 2 is a sectional but permitted to slide a limited distancelongitudinally, by means of bolts a, which play in slots in B. In theslide 0 are mounted the forked swivel-bearings b b for the angle-rollersD. The other ends of these rollers are simi larly mounted; but theforked bearings at that end need not be mounted in a slide.

In order to shift the angle of the rollers, I employ the mechanism whichI will now describe.

Iendent from the slide 0 is an arm, 0, which is coupled toaconnecting-rod, (I. On the end of this rod is a strap which embraces aneccentric, e, on a shaft, f, mounted in the pressframe. Mounted also onthe said shaft f is a disk or wheel, The shaftf may be made rotative,and the eccentric e and disk 9 be fixed thereon; or the shaft may befixed, and the eccentric and disk. be mounted loosely thereon. In thiscase, however, the eccentric and disk must be secured together.

Mounted loosely on shaft f is an arm, 7:,

into the periphery of the disk {1 when the arm is moved forward, and toslip over its surface when the arm is moved backward. The arm k may becaused toreciprocatein anyway; but I prefer to couple its pendent end toa con said rod to a crank, k, on a shaft, Z; This shaft may be mountedin the press-frame and be driven from the same mechanism thatreciprocates the bed of the press. When the crank k rotates, the arm his swung back and forth on shaft f. This causes pawli to bite on disk 9and rotate it intermittently. The eccentric 6 will also be rotatedintermittently, and the slide 0 be thus caused -to move by steps orintervals in one direction a distance equal to the throw of theeccentric, and back again by steps. Now, if the crank k be arranged tobed, it will be seen that each intermittent movement of the rollers willcorrespond with a reciprocation of the bed, and thus the angle of therollers will be changed at each of said reciprocatory movements of thebed. Now, if it requires, say, twenty revolutions of crank it to produceone revolution of the disk (/,then the rollers will be capable ofassuming ten different angles with respect to the akis of the whichbears a pawl or dog, 2', arranged to bite necting-rod, j, and to couplethe other end of turn once at each reciprocation of the pressmovement ofthe bed; but in order to vary these angles to an almost infinite extentI make the circumference of the disk 9 incommensurable with the throw ofthe pawl i-that is to say, the circumference of the disk is notdivisible by the annular intermittent impulse imparted by .the pawlwithout a remainder. Thus the rollers will not present themselves twiceat the same angle to the same part of the reciprocating bed, except atlong intervals. The revolutions of the crank k might also be madenon-synchronous with the movements of the reciprocating bed, and alsoincommensurable therewith-that is to say, the crank may not make itsrevolutions at the same time with the reciprocation of the bed, nor inthe same period.

The mechanism may be so arranged that the rollers will shift theirangles while the bed is passing under them, or the shifting may be donewhile the rollers are unemployed.

In lieu of a crank, k, arranged to give a regular oscillating movementto the pawl or dog i, I may employ a cam to move said pawl forward, anda spring, 172, to retract it, as shown in Fig. 4; or any otherwell-knownmechanical means may be employed for actuating said pawl.

In lieu of a smooth disk, 9, I may employ a ratchet-wheel with fineteeth, and in lieu of the lifting dog or pawl i, I may employ afriction-brake shoe of a well-known construction.

In order to prevent the disk from being rotated backward, I employ agravity dog or pawl. a, mounted as shown in Fig. 1.

The rollers may be mounted in such a man ner as to always stand at someangle, more or less acute, with the axis of the movement of the bed.This is shown in Fig. 3, where the full lines show the rollers at theirmost acute angle with the axis of the bed, and the dotted in this; and Imay also employ a crank in lieu of the eccentric c.

Having thus described my invention, I claini 1. In a printing-press,means, substantially the reciprocating bed, and whereby the rollers arepresented to the bed at constantly-varying angles, in order to effect abetter-distributi on of the ink, substantially as set forth.

2. As a means for shifting the angle of the angle-rollers ofaprinting-press, a slide mounted on the press-frame to receive theswiveled bearings of the rollers, the said bearings and mechanism,substantially as described, for inr parting an intermittent step-by-stepmotion to said slide, substantially asset forth.

3. As a means for shifting the angle of the angle-rollers of aprinting-press, aslide mounted on the press-frame to receive theswiveled bearings for the rollers, the said bearings, a connecting-rod,and eccentric arranged to in1- part to said slide a reciprocatingmotion, a disk, 9, arranged to rotate with the eccentric, and means,substantially as described, for imparting an intermittent rotatingmotion to said disk 9, substantially as setforth.

4. As a means for shifting the angles of angle-rollers forprinting-presses, a slide mounted on the press-frame and provided withbean ings for ,one end of the roller, a connecting-rod V and eccentricarranged to impart a reciprocatory motion to the said slide, adisk, 'q,mounted to rotate with said eccentric, and a radiallymounted pawl, 'i,or itsspecified equivalent, provided with means for imparting to saidpawl aswinging reciprocating motion, where by the disk will beintermittently rotated, the distance through which-said pawl moves being incommensurable with the measure of the circumference of the disk 9,substantially as and for the purposes set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

ANDREWV CAMPBELL.

\Vitnesses:

D. E. FARRELL, A. R. HILLYER.

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